Control valve for heating systems



Oct- 1933- W. J. CRAWFORD 1,929,198

v CONTROL VALVE FOR HEATING SYSTEMS Fild April 23. 1952 Patented Oct. 3, 1933 I Q UNITED STATESPATENT OFFICE 1,929,198 CONTROL VALVE roa HEATING SYSTEMS William John Crawford, Niagara Falls, Ontario, Canada Application April 23, 1932. Serial No. 607,077

10 Claims. (01.137-153) The object of the present invention is to proterior of a bellows 17 to which it is rigidly conduce a valve for automatically controlling the nected. The connection is made to the bottom water in a hot water heating system. The valve end platelS of the bellows. The bellows has an is designed to automatically replenish water as expansion element 19 of copper attached to the it is required and also to relieve pressure as it top plate 20 which is centrally depressed to pro- 80 becomes excessive. In this manner the device vide a recess for a compression spring 21. The regulates the heatingsystem so that it does not spring is seated in the recess to apply downward require attention insofar as the water supply and pressure on the plate; which plate is attached pressure control is concerne f by the inner stem 21' to the waste valve 14.

This device eliminates the ordinary water 'sup The upper end of the spring is seated against 65 ply tank with which domestic hot water systems a plug 22 regulated by a set-screw 23 threadedly are commonly equipped. This invention while engaged in the top member 24. This top member primarily designed for hot water heating systems is stationary and forms a part of the head 25. may be utilized in other capacities, and it is there- Rods 26 attach the top member 24 to a bottom fore not intended to restrict it in this respect. member 27 having a central hollow boss 28 Referring to the accompanying drawing, Figure threadedly engaged with a gland 29. The gland l is a vertical end elevation of the device. is connected by a nipple 30 to the valve body 5. Figure 2 is a vertical sectional view of the de- The nipple is threaded over its entire len th wi h vice taken at right angles to Figure 1. the exception of an intermediate hexagonal sec- 20 Figure 3 is a cross section taken on the line tion 31 receptive to a tool for turning it. A right- 33 of Figure 2. hand thread is used on both the nipple connec- Figure 4 is a cross section taken on the line tions so that as the nippleis turned in one di- 4-4 of Figure 2. rection or the other it will feed out of one con Like numerals or reference indicate correnection and into the other without disturbing the sponding parts in each of the figures throughrelative position of the head with respect to the 30 out the drawing of the invention. valve body 5. A compression spring 32 is seated According to this invention, a valve body 5 against h ppe end of h pp T p n is employed having an inlet 6 for connection to is also seated against the bottom plate 18 of the the cold Water supply pipe of the usual city wabellows 17 in order to apply pressure thereon to 30 ter system or the equivalent. The opposite end unseat the valve proper of the valve has an outlet 7 for connection to the 33 is e standard pressure u e Connected to piping leading to the furnace boiler, while interthe Valve body, The e u face 3 Of the mediate of the said inlet and outlet is a throat gauge is engaged y an g e p ate 35 attached 8 having a seat 9 the opening of which is conto the heed to prevent its n 35 trolled by a valve proper l0, hereinafter referred This device operates as follows: In the initial to a th i l t l valve t l th filling of the radiators or" the heating system or admission of c ld fo d w t r t th b il r, replenishing the water therein the bellows 17 is Below the inlet valve is a alv s t 11 l d. positioned to hold the valve proper l0 unseated. ing to a waste outlet 12 to which is attached a h bellows is aided by the spring 3 e ten ion 40 pipe 13 for conducting away water from the heatf wh is edl'usted y t n n h nipple 0- ing system to relieve pressure due to expansion. Welter frem the sOurce 0f pp y ws rom the This valve seat'has its opening controlled by g, inlet 6 through the throat 8 to the outlet 7. valve 14 hereinafter referred to as the "waste W r p e p r h h hollow valve stem valve. 16 to "the bellows 17 and fills the same. As a 45 In the preferred construction of the invention predetermined pressure s reached e bel ows herein illustrated the inlet valve 10 is supplied expand fo cin the bottom plate 18 d wnwardly, with a bellows 15 that functions as a stufllng which carries the hollow stem 16 with it to seat box to prevent leakage about the stem 16. It is to the valve pr p r 10 against h seat 9 to shut on be understood however that any other type of the water. The waste valve 14 remains closed by 5 stufilng box may be used if so desired. The belreason of the greater resistance of the spring 21. lows 15 is of conventional character hence it need Should the hot water in the system expand benot be described in detail. yond a predetermined point it further expands The stem 16 is tubular. Its lower end comthe bellows 17 forcing the top plate upwardly municates with the outlet side of the valve body against the tension of the spring 21. Since the 55 5 while its upper end communicates with the ininner stem 21 is attached to it the waste valve is unseated: this frees sufficient water to lower the pressure and in this manner the device automatically regulates the system.

What I claim is:

1. A device of the class described comprising a valve body, a seat therein having an opening,

a valve proper for controlling the seat opening, a bellows, a support therefor, and a hollow stern connecting the valve proper to the bellows, said stem communicating with the valve body and the bellows.

2. A device of the class described comprising a valve body, a seat therein having an opening, a valve proper for controlling the seat opening, a bellows, a support therefor, a hollow stem connecting the valve proper to the bellows, said stem communicating with thevalve body and the bellows, and a spring applying pressure on the bellows to hold the valve proper in a normal position.

3. A device of the class described comprising a valve body, a seat therein having an opening, a valve proper for controlling the seat opening, a bellows, a support therefor, a hollow stem connecting the valve proper to the bellows, said stem communicating with the valve body and the bellows, a spring applying pressure on the bellows to hold the valve proper in a normal position, and means for adjusting the tension of the spring.

4. A device of the class described comprising the valve body, a pair of aligned seats therein having openings, a valve proper for controlling each seat opening, a tubular stern fixed to one of the two valves proper, a stem extending therethrough and fixed to the other valve proper, a bellows so supported as to enable it to expand under internal pressure, said tubular stern being aflixed to one movable portion of the bellows and the other stem. being afiixed to an oppositely movable portion thereoi't, said hollow stern forming a communication between the valve body and the bellows, and a spring applying pressure on the bellows so as to resist the movement of the inner stem.

5. A. device of the class described comprising a valve body, a pair of aligned seats therein having openings, a valve proper for controlling each seat opening, a tubular stem fixed to one of the two valves proper, a stem extending therethrough and fixed to the other valve proper, and a bellows mounted on said stems and having oppositely movable portions, one of which is affixed to each stem.

6. A device of the class described comprising a valve body,.a pair of aligned seats therein having openings, a valve proper for controlling each seat opening, a tubular stem fixed to one of the two valves proper, a stem extending therethrough and fixed to the other valve proper, a bellows mounted on said stems and having oppositely movable portions, one of which is aflixed to each stem, and means for causing one of the movable portions of the bellows to act under a greater pressure than the other.

7. A device of the class described comprising a valve body, a pair of aligned seats therein having openings, a valve proper for controlling each seat opening, a tubular stern fixed to one of the two valves proper, a stern extending therethrough and fixed to the other valve proper, a bellows mounted on said stems and having oppositely movable portions, one of which is afilxed to each stem, and a spring for causing one of the movable portions of the bellows to act under a greater pressure than the other.

8. A device of the class described comprising a valve body, a pair of aligned seats therein having openings, a valve proper for controlling each seat opening, a tubular stem fixed to one of the two valves proper, a stem extending therethrough and fixed to the other valve proper, a bellows comprising a pair of oppositely movable plates, one of which is fixed to the tubular stem and the other to the inner stem, and a spring for resisting movement of one of the plates.

9. A device of the class described comprising a valve body, a pair of aligned seats therein having openings, a valve proper for controlling each seat opening, a tubular stem fixed to one of the two valves proper, a stem extending therethrough and fixed to the other valve proper, a bellows comprising a pair of oppositely movable plates, one of which is fixed to the tubular stem and the other to the inner stem, a stationary head, and a compression spring sustained by the head and. seated against one of the plates.

10. A device of the class described comprising a valve body, a pair of aligned seats therein hav ing openings, a valve proper for controlling each seat opening, a tubular stern fixed to one of the two valves proper, a stern extending therethrough and fixed to the other valve proper, a bellows comprising a pair of oppositely movable plates, one of which is fixed to the tubular stem and the other to the inner stem, 2. head comprising an upper member, a lower member, rods connecting said members, a nipple threadedly engaging said lower member and said valve body, means for turning said nipple, a coil spring seated against said nipple and one of the said plates of the bellows, and a spring seated against the other plate and adjustably supported by the upper member of the head.

WIILIAM JOHN CRAWFORD. 

